package com.ofek.eventos;

import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.Editable;
import android.text.Html;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import com.google.gson.Gson;
import com.ofek.eventos.db.datatypes.UserCredential;
import com.ofek.eventos.remote.EventosRemote;

/**
 * Activity which displays a login screen to the user, offering registration as
 * well.
 */
public class LoginActivity extends Activity {
	/**
	 * The default email to populate the email field with.
	 */
	public static final String EXTRA_EMAIL = "com.example.android.authenticatordemo.extra.EMAIL";



	/**
	 * Keep track of the login task to ensure we can cancel it if requested.
	 */
	private UserRegisterTask mAuthTask = null;

	// Values for email and password at the time of the login attempt.
	private String mEmail;
	private String mPassword;

	// UI references.
	private EditText mEmailView;
	private EditText mPasswordView;
	private View mLoginFormView;
	private View mLoginStatusView;
	private TextView mLoginStatusMessageView;

	@Override
	protected void onCreate(final Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		if ( EventosApplication.EVENTOS_USER!=null ) {

			//			mLoginStatusView.setVisibility(View.VISIBLE);
			//			mLoginFormView.setVisibility(View.GONE);
			//			new UserLoginTask().execute();
			//			mLoginStatusView.requestFocus();
			finish();
			startActivity(new Intent(getApplicationContext(),EventosActivity.class));
			return;
		}
		setContentView(R.layout.activity_login);
		// Set up the login form.
		mEmail = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString(EXTRA_EMAIL, null);
		mEmailView = (EditText) findViewById(R.id.email);
		mEmailView.setText(mEmail);
		mEmailView.addTextChangedListener(new TextWatcher() {

			@Override
			public void onTextChanged(final CharSequence s, final int start, final int before, final int count) {
				PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).edit().putString(EXTRA_EMAIL,mEmailView.getText().toString()).commit();
			}

			@Override
			public void beforeTextChanged(final CharSequence s, final int start, final int count,
					final int after) {
				// TODO Auto-generated method stub

			}

			@Override
			public void afterTextChanged(final Editable s) {
				// TODO Auto-generated method stub

			}
		});

		mPasswordView = (EditText) findViewById(R.id.password);

		mLoginFormView = findViewById(R.id.login_form);
		mLoginStatusView = findViewById(R.id.login_status);
		mLoginStatusMessageView = (TextView) findViewById(R.id.login_status_message);

		findViewById(R.id.sign_in_button).setOnClickListener(
				new View.OnClickListener() {
					@Override
					public void onClick(final View view) {
						attemptLogin(new UserRegisterTask());
					}
				});
		findViewById(R.id.login).setOnClickListener(
				new View.OnClickListener() {
					@Override
					public void onClick(final View view) {
						attemptLogin(new UserLoginTask());
					}
				});
	}

	@Override
	public boolean onCreateOptionsMenu(final Menu menu) {
		super.onCreateOptionsMenu(menu);
		getMenuInflater().inflate(R.menu.login, menu);
		return true;
	}

	/**
	 * Attempts to sign in or register the account specified by the login form.
	 * If there are form errors (invalid email, missing fields, etc.), the
	 * errors are presented and no actual login attempt is made.
	 */
	public void attemptLogin(final AsyncTask<Void, Void, Boolean> todo) {
		if (mAuthTask != null) {
			return;
		}

		// Reset errors.
		mEmailView.setError(null);
		mPasswordView.setError(null);

		// Store values at the time of the login attempt.
		mEmail = mEmailView.getText().toString();
		mPassword = mPasswordView.getText().toString();

		boolean cancel = false;
		View focusView = null;

		// Check for a valid password.
		if (TextUtils.isEmpty(mPassword)) {
			mPasswordView.setError(Html.fromHtml("<font color='red'>"+getString(R.string.error_field_required)+"</font>"));
			focusView = mPasswordView;
			cancel = true;
		} else if (mPassword.length() < 4) {
			mPasswordView.setError(Html.fromHtml("<font color='red'>"+getString(R.string.error_invalid_password)+"</font>"));
			focusView = mPasswordView;
			cancel = true;
		}

		// Check for a valid email address.
		if (TextUtils.isEmpty(mEmail)) {
			mEmailView.setError(Html.fromHtml("<font color='red'>"+getString(R.string.error_field_required)+"</font>"));
			focusView = mEmailView;
			cancel = true;
		} else if (!mEmail.contains("@")) {
			mEmailView.setError(Html.fromHtml("<font color='red'>"+getString(R.string.error_invalid_email)+"</font>"));
			focusView = mEmailView;
			cancel = true;
		}

		if (cancel) {
			// There was an error; don't attempt login and focus the first
			// form field with an error.
			focusView.requestFocus();
		} else {
			// Show a progress spinner, and kick off a background task to
			// perform the user login attempt.
			mLoginStatusMessageView.setText(R.string.login_progress_signing_in);
			showProgress(true);
			todo.execute((Void) null);
		}
	}

	/**
	 * Shows the progress UI and hides the login form.
	 */
	@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
	private void showProgress(final boolean show) {
		// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
		// for very easy animations. If available, use these APIs to fade-in
		// the progress spinner.
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
			final int shortAnimTime = getResources().getInteger(
					android.R.integer.config_shortAnimTime);

			mLoginStatusView.setVisibility(View.VISIBLE);
			mLoginStatusView.animate().setDuration(shortAnimTime)
			.alpha(show ? 1 : 0)
			.setListener(new AnimatorListenerAdapter() {
				@Override
				public void onAnimationEnd(final Animator animation) {
					mLoginStatusView.setVisibility(show ? View.VISIBLE
							: View.GONE);
				}
			});

			mLoginFormView.setVisibility(View.VISIBLE);
			mLoginFormView.animate().setDuration(shortAnimTime)
			.alpha(show ? 0 : 1)
			.setListener(new AnimatorListenerAdapter() {
				@Override
				public void onAnimationEnd(final Animator animation) {
					mLoginFormView.setVisibility(show ? View.GONE
							: View.VISIBLE);
				}
			});
		} else {
			// The ViewPropertyAnimator APIs are not available, so simply show
			// and hide the relevant UI components.
			mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
			mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
		}
	}
	public static final String md5(final String s) {
		final String MD5 = "MD5";
		try {
			// Create MD5 Hash
			final MessageDigest digest = java.security.MessageDigest
					.getInstance(MD5);
			digest.update(s.getBytes());
			final byte messageDigest[] = digest.digest();

			// Create Hex String
			final StringBuilder hexString = new StringBuilder();
			for (final byte aMessageDigest : messageDigest) {
				String h = Integer.toHexString(0xFF & aMessageDigest);
				while (h.length() < 2)
					h = "0" + h;
				hexString.append(h);
			}
			return hexString.toString();

		} catch (final NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return "";
	}
	/**
	 * Represents an asynchronous login/registration task used to authenticate
	 * the user.
	 */
	public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {
		private UserCredential user;

		@Override
		protected Boolean doInBackground(final Void... params) {
			final EventosRemote eventosRemoteService = new EventosRemote();
			user = new UserCredential();
			user.id = mEmail;
			user.pw = md5(mPassword);
			return true;//eventosRemoteService.login(user);
			//return false;
		}

		@Override
		protected void onPostExecute(final Boolean success) {
			mAuthTask = null;
			if (success) {
				EventosApplication.EVENTOS_USER=user;
				finish();
				PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).edit().putString(EventosApplication.KEY_USER, new Gson().toJson(EventosApplication.EVENTOS_USER)).commit();
				startActivity(new Intent(getApplicationContext(),EventosActivity.class));
			} else {
				mPasswordView
				.setError(Html.fromHtml("<font color='red'>"+getString(R.string.error_incorrect_password)+"</font>"));
				mPasswordView.requestFocus();
			}
		}

		@Override
		protected void onCancelled() {
			mAuthTask = null;
		}
	}
	/**
	 * Represents an asynchronous login/registration task used to authenticate
	 * the user.
	 */
	public class UserRegisterTask extends AsyncTask<Void, Void, Boolean> {
		private UserCredential user;

		@Override
		protected Boolean doInBackground(final Void... params) {
			final EventosRemote eventosRemoteService = new EventosRemote();
			try {
				user = new UserCredential();
				user.id = mEmail;
				user.pw = md5(mPassword);
				return eventosRemoteService.register(user);
			} catch (final IOException e) {
				e.printStackTrace();
			}
			return false;
		}

		@Override
		protected void onPostExecute(final Boolean success) {
			mAuthTask = null;


			if (success) {
				EventosApplication.EVENTOS_USER=user;
				finish();
				PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).edit().putString(EventosApplication.KEY_USER, new Gson().toJson(EventosApplication.EVENTOS_USER)).commit();
				startActivity(new Intent(getApplicationContext(),EventosActivity.class));
			} else {
				showProgress(false);
				mEmailView
				.setError(Html.fromHtml("<font color='red'>"+getString(R.string.error_incorrect_password)+"</font>"));
				mEmailView.requestFocus();
			}
		}

		@Override
		protected void onCancelled() {
			mAuthTask = null;
			showProgress(false);
		}
	}
}
